Answer: Pituitary.
- A Thyroid
- B Adrenal
- C Pituitary
- D Pancreas
Correct answer: C. Pituitary
Explanation: The pituitary gland is the master endocrine gland. It secretes hormones that regulate other endocrine glands (TSH, FSH, LH, ACTH, GH, ADH).
The hypothalamus releases hormones that direct the pituitary, which releases its own trophic hormone to a target gland; that gland's hormone output then feeds back (dashed lines) to suppress both the pituitary and hypothalamus once levels are sufficient - a self-correcting loop running the entire endocrine system.
Concept context
The endocrine glands, hormone classification and mechanism of action, and negative feedback regulation.